| 摘要 |
PROBLEM TO BE SOLVED: To provide a circuit for sensing closing of a refrigerator door, utilizing a Hall sensor capable of sensing a closing state of the refrigerator door correctly by utilizing Hall effect induced from the Hall sensor at closing of the refrigerator door. SOLUTION: This circuit comprises a permanent magnet 100 provided on a specified position of a refrigerator door and applying a magnetic field, a Hall sensor 200 provided on a specified position of a refrigerator body and corresponding to the permanent magnet 100 and conducting switching operation by utilizing the Hall effect induced by the change in the magnetic field by closing the refrigerator door, and a microcomputer 300 sensing a closing state of the refrigerator door based on a voltage input by the switching operation of the Hall sensor 200. |
